they look high in N and low in calmag.
They are also showing beginning signs of N and P deficiencies which is in line with not having enough calmag and too much N. Give em a decent calmag formula with PK booster for a while but without grow or and low to no regular bloom feed for a couple waterings, and you should be good. Maybe an enzyme based flushing product to help dissolve the current state but I don’t think that’s really necessary at this point.
AZ pointed out pH issues could be it, and then someone else commented pH is not important in soil, I’d like to add, IN A WELL BALANCED SOIL. But maybe your balance is just gone. Or maybe they are rootbound. Those things will matter to the soil biosphere. I never pH adjust specifically but I do add in some lactic acids now and then; but I grow organic with added living organisms and I’ve been doing so for a long time now.
Anyway, if you’re checking pH I’d go for a slightly higher pH of 6.5 because you’re growing under LED and LED requires more calmag in the plant because of the lower leaf temps, imo. But I’ve got little experience with chemical ferts so if you’re growing chemical don’t take my advice for gospel.